Year	Percent
1960	3.94121
1961	-0.46555
1962	-0.4835
1963	-0.48447
1964	-0.47263
1965	-0.83357
1966	-1.2036
1967	-1.23365
1968	-1.20088
1969	-1.1671
1970	-0.5338
1971	0.02652
1972	-0.07368
1973	-0.07263
1974	-0.05755
1975	0.74337
1976	0.51877
1977	0.40039
1978	1.04987
1979	1.02367
1980	1.05763
1981	0.74537
1982	2.15483
1983	1.41848
1984	0.03099
1985	1.7655
1986	1.75893
1987	0.82303
1988	0.9531
1989	1.10406
1990	1.10669
1991	2.82354
1992	1.15737
1993	1.12246
1994	1.05861
1995	0.81908
1996	0.91468
1997	1.0973
1998	0.97829
1999	0.91055
2000	0.9523
2001	1.04609
2002	1.03009
2003	0.93183
2004	0.9363
2005	0.89193
2006	0.51274
2007	0.42659
2008	0.72743
2009	0.83056
2010	0.56657
2011	0.49705
2012	0.97361
2013	1.47599
2014	2.06885
2015	2.45741
2016	2.3585
2017	2.22848